users = {
    'lwj': {
        'username': 'cattom',
        'passwd': 'lwjdsb',
        'id': 1
    },

    'lucifer':{
        'username': 'admin',
        'passwd': '1234567lwjsdsb',
        'id': 0
    }
}

for name , wd in users.items() :
    print("Username:" + name)
    netname = wd['username']
    print("Netname:" + netname)
    print("\t")